<p></p>
<p dir="auto">We don't need to know the user's timezone, it can be processed by the browser. If the date is supplied as Unix timestamp (<code class="notranslate"><time datetime="unix_timestamp_in_UTC">fallback</time></code>), then we can have some JS code to convert into the local time</p>
<div class="highlight highlight-source-js" dir="auto"><pre class="notranslate"><span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-en">onload</span><span class="pl-kos">(</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-c1">=></span><span class="pl-kos">{</span>
<span class="pl-k">var</span> <span class="pl-s1">time_els</span> <span class="pl-c1">=</span> <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-kos">.</span><span class="pl-en">querySelectorAll</span><span class="pl-kos">(</span><span class="pl-s">"time"</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-k">for</span> <span class="pl-kos">(</span><span class="pl-s1">i</span> <span class="pl-c1">=</span> <span class="pl-c1">0</span><span class="pl-kos">;</span> <span class="pl-s1">i</span> <span class="pl-c1"><</span> <span class="pl-s1">time_els</span><span class="pl-kos">.</span><span class="pl-c1">length</span><span class="pl-kos">;</span> <span class="pl-s1">i</span><span class="pl-c1">++</span><span class="pl-kos">)</span> <span class="pl-kos">{</span>
  <span class="pl-s1">time_els</span><span class="pl-kos">.</span><span class="pl-c1">innerText</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">Date</span><span class="pl-kos">(</span><span class="pl-k">new</span> <span class="pl-v">Date</span><span class="pl-kos">(</span><span class="pl-s1">time_els</span><span class="pl-kos">.</span><span class="pl-en">getAttribute</span><span class="pl-kos">(</span><span class="pl-s">"datetime"</span><span class="pl-kos">)</span> <span class="pl-c1">*</span> <span class="pl-c1">1000</span><span class="pl-kos">)</span> <span class="pl-c1">+</span> <span class="pl-s">"UTC"</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">toLocaleString</span><span class="pl-kos">(</span><span class="pl-s">"xx"</span><span class="pl-kos">)</span><span class="pl-kos">;</span>
<span class="pl-kos">}</span>
<span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>
<p dir="auto">The fallback is optional, it is needed for ancient browsers and browsers that don't support Javascript.</p>
<p dir="auto"><code class="notranslate">xx</code> is the locale, it can be "en" or "en-us", regardless it will produce correct results.</p>
<p dir="auto"><code class="notranslate">toLocaleString</code>  seems to be supported by all major browsers (see <a href="https://caniuse.com/mdn-javascript_builtins_date_tolocalestring" rel="nofollow">https://caniuse.com/mdn-javascript_builtins_date_tolocalestring</a>).</p>

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